Book stand



FIG. 1 is a perspective view of a book stand showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof; and,

FIG. 6 is a left side elevational view with the right side being a mirror image thereof.

The broken lines showing a book atop the book stand and a reader of said book below the book stand in FIG. 1 are for demonstrative purposes only and form no part of the claimed design. 

The ornamental design for a book stand, as shown and described. 